Miller/Knox LagoonMiller/Knox Lagoon is a lake in Richmond, California.OverviewThe lake is fed by underground salt water from San Pablo Bay and is man-made. It is located in the Pt. Richmond neighborhood. The pond is located within Miller/Knox Regional Park. The hole in the ground that was filled to form a water body was formerly part of quarries used during public works in the city of Richmond during the World War II home front.